LM311DG4 Equivalent & Substitute Parts

Part Overview

The LM311DG4 is a general-purpose voltage comparator manufactured by Texas Instruments, housed in an 8-SOIC surface-mount package. This device features MOS, open-collector, and open-emitter output configurations with TTL compatibility, designed for precision comparison applications across a wide supply voltage range of 4.6V to 30V (single supply) or ±1.75V to ±15V (dual supply).

The LM311DG4 is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications currently utilizing this comparator.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	LM311DG4
Category	Linear Comparator
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Number of Elements	1
Output Type	MOS, Open-Collector, Open-Emitter, TTL
Voltage - Supply, Single/Dual (±)	4.6V ~ 30V, ±1.75V ~ 15V
Voltage - Input Offset (Max)	7.5mV @ ±15V
Current - Input Bias (Max)	0.25µA @ ±15V
Current - Quiescent (Max)	7.5mA
Operating Temperature	0°C ~ 70°C
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the LM311DG4 is determined by the following critical parameters:

Primary Substitution Criteria:

Package / Case: 8-SOIC (0.154", 3.90mm Width) — mechanical and electrical compatibility
Mounting Type: Surface Mount — PCB assembly compatibility
Output Type: MOS, Open-Collector, Open-Emitter, TTL — functional output configuration
Voltage - Supply, Single/Dual (±): Must support minimum 4.6V ~ 30V (single) or ±1.75V ~ 15V (dual)
Voltage - Input Offset (Max): Must not exceed 7.5mV @ ±15V
Current - Input Bias (Max): Must not exceed 0.25µA @ ±15V
Current - Quiescent (Max): Must not exceed 7.5mA
Operating Temperature: Must support minimum 0°C ~ 70°C range

Substitute parts are grouped into two categories:

MFR Recommended Substitutes: Parts meeting or exceeding all primary criteria with active or equivalent product status.

Parametric Equivalents: Parts with identical electrical specifications and package compatibility, differing only in manufacturer designation or product status.

Parameter Comparison

Part Number	Manufacturer	Product Status	Package	Output Type	Supply Voltage (Single/Dual)	Input Offset Max @ ±15V	Input Bias Max @ ±15V	Quiescent Current Max	Operating Temp	RoHS Status
LM311DG4	Texas Instruments	Obsolete	8-SOIC	MOS, Open-Collector, Open-Emitter, TTL	4.6V ~ 30V, ±1.75V ~ 15V	7.5mV	0.25µA	7.5mA	0°C ~ 70°C	ROHS3 Compliant
LM311D	National Semiconductor	Obsolete	8-SOIC	MOS, Open-Collector, Open-Emitter, TTL	4.6V ~ 30V, ±1.75V ~ 15V	7.5mV	0.25µA	7.5mA	0°C ~ 70°C	RoHS non-compliant
LM311DR2G	onsemi	Active	8-SOIC	DTL, MOS, Open-Collector, Open-Emitter, RTL, TTL	5V ~ 30V, ±2.5V ~ 15V	7.5mV	0.25µA	7.5mA	0°C ~ 70°C	ROHS3 Compliant
LT1011AIS8#PBF	Analog Devices Inc.	Active	8-SOIC	Open-Collector	3V ~ 36V, ±1.5V ~ 18V	0.75mV	0.035µA	4mA	-40°C ~ 85°C	ROHS3 Compliant
LT1011AIS8#TRPBF	Analog Devices Inc.	Active	8-SOIC	Open-Collector	3V ~ 36V, ±1.5V ~ 18V	0.75mV	0.035µA	4mA	-40°C ~ 85°C	ROHS3 Compliant
LT1011CS8#PBF	Analog Devices Inc.	Active	8-SOIC	Open-Collector	3V ~ 36V, ±1.5V ~ 18V	2mV	0.065µA	4mA	0°C ~ 70°C	ROHS3 Compliant
LT1011CS8#TRPBF	Analog Devices Inc.	Active	8-SOIC	Open-Collector	3V ~ 36V, ±1.5V ~ 18V	2mV	0.065µA	4mA	0°C ~ 70°C	ROHS3 Compliant
LT1011IS8#PBF	Analog Devices Inc.	Active	8-SOIC	Open-Collector	3V ~ 36V, ±1.5V ~ 18V	2mV	0.065µA	4mA	-40°C ~ 85°C	ROHS3 Compliant
LT1011IS8#TRPBF	Analog Devices Inc.	Active	8-SOIC	Open-Collector	3V ~ 36V, ±1.5V ~ 18V	2mV	0.065µA	4mA	-40°C ~ 85°C	ROHS3 Compliant
LM311DE4	Texas Instruments	Obsolete	8-SOIC	MOS, Open-Collector, Open-Emitter, TTL	4.6V ~ 30V, ±1.75V ~ 15V	7.5mV	0.25µA	7.5mA	0°C ~ 70°C	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): LM311DE4 provides parametric equivalence to the LM311DG4 with identical electrical characteristics and package configuration. Both devices are obsolete; however, LM311DE4 maintains ROHS3 compliance.

For Active Product Status with Enhanced Performance: LM311DR2G (onsemi) is the primary active substitute. It maintains the LM311 base product architecture with expanded output type support (DTL, MOS, Open-Collector, Open-Emitter, RTL, TTL) and ROHS3 compliance. Supply voltage range extends to 5V minimum (single supply), which accommodates the original 4.6V specification within typical operating margins.

For Superior Electrical Performance: LT1011 series comparators (Analog Devices Inc.) offer improved specifications across all active product variants: reduced input offset voltage (0.75mV to 2mV versus 7.5mV), lower input bias current (0.035µA to 0.065µA versus 0.25µA), and reduced quiescent current (4mA versus 7.5mA). All LT1011 variants are active products with ROHS3 compliance. Operating temperature ranges extend to -40°C ~ 85°C for industrial-grade variants (LT1011AIS8, LT1011IS8).

Packaging Considerations: All substitute parts maintain 8-SOIC surface-mount package compatibility. Packaging variants (Tube, Cut Tape & Digi-Reel, Tape & Reel) are available across the LT1011 series to match procurement and assembly requirements.

Frequently Asked Questions (FAQ)

Q: Can LM311DR2G directly replace LM311DG4 in existing designs? A: Yes. LM311DR2G maintains identical package geometry (8-SOIC), output type compatibility, and electrical specifications within the original operating parameters. The minimum supply voltage specification (5V single supply) is higher than the original (4.6V), but this does not prevent substitution in applications operating above 5V. Designs requiring operation below 5V single supply should use LT1011 series alternatives.

Q: What is the primary advantage of LT1011 series substitutes over LM311DR2G? A: LT1011 comparators provide superior electrical performance with significantly lower input offset voltage (0.75mV to 2mV versus 7.5mV), lower input bias current (0.035µA to 0.065µA versus 0.25µA), and reduced quiescent current consumption (4mA versus 7.5mA). These improvements reduce circuit noise, lower power consumption, and improve overall system accuracy. All LT1011 variants are active products with extended availability.

Q: Are there differences between LT1011 packaging variants (Tube, Cut Tape & Digi-Reel, Tape & Reel)? A: Packaging variants differ only in delivery format and do not affect electrical performance or package geometry. Tube packaging is suitable for manual assembly or small-volume production. Cut Tape & Digi-Reel and Tape & Reel formats are optimized for automated pick-and-place assembly. Selection depends on manufacturing process requirements, not circuit functionality.

Q: What is the difference between LT1011AIS8, LT1011CS8, and LT1011IS8 variants? A: These variants differ in operating temperature range and input offset voltage specifications. LT1011AIS8 operates from -40°C to 85°C with 0.75mV input offset. LT1011CS8 and LT1011IS8 operate from 0°C to 70°C and -40°C to 85°C respectively, both with 2mV input offset. Selection depends on application temperature requirements and offset voltage tolerance.

Q: Is LM311D (National Semiconductor) a viable substitute? A: LM311D provides parametric equivalence to LM311DG4 with identical electrical specifications and package compatibility. However, LM311D is RoHS non-compliant, whereas LM311DG4 is ROHS3 compliant. For applications requiring RoHS compliance, LM311D is not recommended. LM311DR2G or LT1011 series are preferred alternatives.

Q: Can I use LT1011 in applications originally designed for LM311? A: Yes, with design verification. LT1011 comparators are functionally compatible and offer superior performance. The primary consideration is output type: LT1011 devices feature open-collector output only, whereas LM311 supports MOS, open-collector, and open-emitter configurations. Verify that open-collector output meets circuit requirements. Supply voltage range compatibility must also be confirmed for applications operating below 3V.

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